| 1 | #!/usr/bin/env bash |
| 2 | # group: rw auto quick |
| 3 | # |
| 4 | # Test case for preallocated zero clusters in qcow2 |
| 5 | # |
| 6 | # Copyright (C) 2013 Red Hat, Inc. |
| 7 | # |
| 8 | # This program is free software; you can redistribute it and/or modify |
| 9 | # it under the terms of the GNU General Public License as published by |
| 10 | # the Free Software Foundation; either version 2 of the License, or |
| 11 | # (at your option) any later version. |
| 12 | # |
| 13 | # This program is distributed in the hope that it will be useful, |
| 14 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | # GNU General Public License for more details. |
| 17 | # |
| 18 | # You should have received a copy of the GNU General Public License |
| 19 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | # |
| 21 | |
| 22 | # creator |
| 23 | owner=hreitz@redhat.com |
| 24 | |
| 25 | seq="$(basename $0)" |
| 26 | echo "QA output created by $seq" |
| 27 | |
| 28 | status=1 # failure is the default! |
| 29 | |
| 30 | _cleanup() |
| 31 | { |
| 32 | _cleanup_test_img |
| 33 | } |
| 34 | trap "_cleanup; exit \$status" 0 1 2 3 15 |
| 35 | |
| 36 | # get standard environment, filters and checks |
| 37 | . ./common.rc |
| 38 | . ./common.filter |
| 39 | |
| 40 | # This tests qcow2-specific low-level functionality |
| 41 | _supported_fmt qcow2 |
| 42 | _supported_proto file |
| 43 | # We need zero clusters and snapshots |
| 44 | # (TODO: Consider splitting the snapshot part into a separate test |
| 45 | # file, so this one runs with refcount_bits=1 and data_file) |
| 46 | _unsupported_imgopts 'compat=0.10' 'refcount_bits=1[^0-9]' data_file |
| 47 | |
| 48 | # Intentionally create an unaligned image |
| 49 | IMG_SIZE=$((64 * 1024 * 1024 + 512)) |
| 50 | |
| 51 | echo |
| 52 | echo "=== Testing cluster discards ===" |
| 53 | echo |
| 54 | _make_test_img $IMG_SIZE |
| 55 | # Write some normal clusters, zero some of them (creating preallocated |
| 56 | # zero clusters) and discard everything. Everything should now read as 0. |
| 57 | $QEMU_IO -c "write 0 256k" -c "write -z 0 256k" -c "write 64M 512" \ |
| 58 | -c "discard 0 $IMG_SIZE" -c "read -P 0 0 $IMG_SIZE" "$TEST_IMG" \ |
| 59 | | _filter_qemu_io |
| 60 | |
| 61 | # Check the image (there shouldn't be any leaks) |
| 62 | _check_test_img |
| 63 | # Map the image (we want all clusters to be gone) |
| 64 | $QEMU_IMG map "$TEST_IMG" |
| 65 | |
| 66 | _cleanup_test_img |
| 67 | |
| 68 | |
| 69 | echo |
| 70 | echo '=== Writing to preallocated zero clusters ===' |
| 71 | echo |
| 72 | |
| 73 | _make_test_img $IMG_SIZE |
| 74 | |
| 75 | # Create data clusters (not aligned to an L2 table) |
| 76 | $QEMU_IO -c 'write -P 42 1M 256k' "$TEST_IMG" | _filter_qemu_io |
| 77 | orig_map=$($QEMU_IMG map --output=json "$TEST_IMG") |
| 78 | |
| 79 | # Convert the data clusters to preallocated zero clusters |
| 80 | $QEMU_IO -c 'write -z 1M 256k' "$TEST_IMG" | _filter_qemu_io |
| 81 | |
| 82 | # Now write to them (with a COW needed for the head and tail) |
| 83 | $QEMU_IO -c "write -P 23 $(((1024 + 32) * 1024)) 192k" "$TEST_IMG" \ |
| 84 | | _filter_qemu_io |
| 85 | |
| 86 | # Check metadata correctness |
| 87 | _check_test_img |
| 88 | |
| 89 | # Check data correctness |
| 90 | $QEMU_IO -c "read -P 0 $(( 1024 * 1024)) 32k" \ |
| 91 | -c "read -P 23 $(((1024 + 32) * 1024)) 192k" \ |
| 92 | -c "read -P 0 $(((1024 + 32 + 192) * 1024)) 32k" \ |
| 93 | "$TEST_IMG" \ |
| 94 | | _filter_qemu_io |
| 95 | |
| 96 | # Check that we have actually reused the original area |
| 97 | new_map=$($QEMU_IMG map --output=json "$TEST_IMG") |
| 98 | if [ "$new_map" = "$orig_map" ]; then |
| 99 | echo 'Successfully reused original clusters.' |
| 100 | else |
| 101 | echo 'Failed to reuse original clusters.' |
| 102 | echo 'Original map:' |
| 103 | echo "$orig_map" |
| 104 | echo 'New map:' |
| 105 | echo "$new_map" |
| 106 | fi |
| 107 | |
| 108 | _cleanup_test_img |
| 109 | |
| 110 | |
| 111 | echo |
| 112 | echo '=== Writing to a snapshotted preallocated zero cluster ===' |
| 113 | echo |
| 114 | |
| 115 | _make_test_img 64k |
| 116 | |
| 117 | # Create a preallocated zero cluster |
| 118 | $QEMU_IO -c 'write -P 42 0 64k' -c 'write -z 0 64k' "$TEST_IMG" \ |
| 119 | | _filter_qemu_io |
| 120 | |
| 121 | # Snapshot it |
| 122 | $QEMU_IMG snapshot -c foo "$TEST_IMG" |
| 123 | |
| 124 | # Write to the cluster |
| 125 | $QEMU_IO -c 'write -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io |
| 126 | |
| 127 | # Check metadata correctness |
| 128 | _check_test_img |
| 129 | |
| 130 | # Check data correctness |
| 131 | $QEMU_IO -c 'read -P 23 0 64k' "$TEST_IMG" | _filter_qemu_io |
| 132 | $QEMU_IMG snapshot -a foo "$TEST_IMG" |
| 133 | $QEMU_IO -c 'read -P 0 0 64k' "$TEST_IMG" | _filter_qemu_io |
| 134 | |
| 135 | _cleanup_test_img |
| 136 | |
| 137 | |
| 138 | echo |
| 139 | echo '=== Consecutive write to a preallocated zero cluster ===' |
| 140 | echo |
| 141 | |
| 142 | _make_test_img 192k |
| 143 | |
| 144 | # Create three normal clusters |
| 145 | $QEMU_IO -c 'write -P 42 0 192k' "$TEST_IMG" | _filter_qemu_io |
| 146 | orig_map=$($QEMU_IMG map --output=json "$TEST_IMG") |
| 147 | |
| 148 | # Make the middle cluster a preallocated zero cluster |
| 149 | $QEMU_IO -c 'write -z 64k 64k' "$TEST_IMG" | _filter_qemu_io |
| 150 | |
| 151 | # Try to overwrite everything: This should reuse the whole range. To test that |
| 152 | # this only issues a single continuous write request, use blkdebug. |
| 153 | $QEMU_IO -c 'write -P 42 0 192k' \ |
| 154 | "json:{ |
| 155 | 'driver': '$IMGFMT', |
| 156 | 'file': { |
| 157 | 'driver': 'blkdebug', |
| 158 | 'image.filename': '$TEST_IMG', |
| 159 | 'set-state': [{ |
| 160 | 'event': 'write_aio', |
| 161 | 'new_state': 2 |
| 162 | }], |
| 163 | 'inject-error': [{ |
| 164 | 'event': 'write_aio', |
| 165 | 'state': 2 |
| 166 | }] |
| 167 | } |
| 168 | }" \ |
| 169 | | _filter_qemu_io |
| 170 | |
| 171 | # Check metadata correctness |
| 172 | _check_test_img |
| 173 | |
| 174 | # Check that we have actually reused the original area |
| 175 | new_map=$($QEMU_IMG map --output=json "$TEST_IMG") |
| 176 | if [ "$new_map" = "$orig_map" ]; then |
| 177 | echo 'Successfully reused original clusters.' |
| 178 | else |
| 179 | echo 'Failed to reuse original clusters.' |
| 180 | echo 'Original map:' |
| 181 | echo "$orig_map" |
| 182 | echo 'New map:' |
| 183 | echo "$new_map" |
| 184 | fi |
| 185 | |
| 186 | _cleanup_test_img |
| 187 | |
| 188 | |
| 189 | # success, all done |
| 190 | echo "*** done" |
| 191 | rm -f $seq.full |
| 192 | status=0 |